msitekkie:
Currently when you try to delete any PDF file if the view includes the preview window the deletion get's blocked with a message saying the file is open in PDF Shell tools. This is a real nuisance to the point that I actually disable the shell tools preview functionality.

Please update so that PDF Shell tools does not hold the file open, thus allowing PDF files to be deleted.

RTT:
You should be able to delete the file if the preview handler is loaded with the metadata edit panel closed. The shell sends an unload command, when deleting or the file properties dialog is invoked. Sometimes there is the need to click the "file in use" dialog retry button, because the PDF is still unloading.

And I have already coded a solution that fixes this issue, and related for when trying to rename the file, for when the metadata panel is open too. Should be a no issue anymore, with the next release.